gugadozero / asm64-tictactoe

A tictactoe wrote in assembly 64 bits for linux

asm64-tictactoe

A tictactoe wrote in assembly 64 bits for linux

This an adaptation from a tictactoe game wrote in assembly 16 bits using DOS interruptions. Now a 64 bit assembly game using linux syscalls instead.

The original game: https://github.com/RobertoDebarba/tictactoe-8086

Build:

nasm -f elf64 tictactoe.asm

ld -o tictactoe tictactoe.o

Have fun!

asm64-tictactoe's Issues

Dereferencing game_position_pointer leads to a segmentation fault

When an attempt to dereference the game_position_pointer is made, just like at this function:

update_draw:
    mov rbx, [game_position_pointer + rax]    
    mov rsi, player   
    cmp byte[rsi], "0"
    je draw_x
    
    cmp byte[rsi], "1"
    je draw_o
    
    draw_x:
        mov cl, "x"
        jmp update
        
    draw_o:
        mov cl, "o"
        jmp update
        
    update:
        mov [rbx], cl    <-  Here the problem
    
    ret

It lead us to a segmentation fault.

PS: The game_position_pointer is a quadword array that holds the address of each house of the board, but it seems that it loses all its addresses after the call to clear_screen function, so the failure.